:root {
    --cyber-primary: #00ff9f;
    --cyber-secondary: #00b8ff;
    --cyber-accent: #ff2a6d;
    --cyber-warning: #ffd700;
    --cyber-background: #1a1a1a;
    --cyber-dark: #141414;
    --cyber-border: #2a2a2a;
    --cyber-text: #e0e0e0;
    --cyber-glow: 0 0 10px rgba(0, 255, 159, 0.5);
    --cyber-glow-secondary: 0 0 10px rgba(0, 184, 255, 0.5);
    --cyber-glow-accent: 0 0 10px rgba(255, 42, 109, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Rajdhani', 'Orbitron', sans-serif;
    background-color: var(--cyber-background);
    background-image: 
        linear-gradient(45deg, var(--cyber-dark) 25%, transparent 25%),
        linear-gradient(-45deg, var(--cyber-dark) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--cyber-dark) 75%),
        linear-gradient(-45deg, transparent 75%, var(--cyber-dark) 75%);
    background-size: 20px 20px;
    padding: 20px;
    color: var(--cyber-text);
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    background-color: var(--cyber-dark);
    padding: 30px;
    border: 1px solid var(--cyber-border);
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0, 255, 159, 0.1);
    position: relative;
}

.container::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, var(--cyber-primary), var(--cyber-secondary));
    z-index: -1;
    border-radius: 10px;
    opacity: 0.3;
}

/* 头部导航 */
.header-nav {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--cyber-border);
}

.back-btn {
    padding: 10px 20px;
    background-color: transparent;
    border: 1px solid var(--cyber-secondary);
    color: var(--cyber-secondary);
    text-decoration: none;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: bold;
    transition: all 0.3s ease;
    font-size: 0.9em;
}

.back-btn:hover {
    background-color: var(--cyber-secondary);
    color: var(--cyber-dark);
    box-shadow: var(--cyber-glow-secondary);
}

.page-title {
    color: var(--cyber-primary);
    font-size: 2.5em;
    text-transform: uppercase;
    letter-spacing: 3px;
    text-shadow: var(--cyber-glow);
    font-family: 'Orbitron', sans-serif;
}

/* 主内容 */
.main-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 25px;
    margin-bottom: 30px;
}

/* 工具栏 */
.toolbar {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.toolbar-section {
    background-color: rgba(26, 26, 26, 0.8);
    border: 1px solid var(--cyber-border);
    border-radius: 6px;
    padding: 20px;
}

.toolbar-title {
    color: var(--cyber-primary);
    font-size: 1.1em;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.tool-label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    color: var(--cyber-text);
    font-size: 0.95em;
}

.tool-label span:first-child {
    color: var(--cyber-secondary);
    font-weight: bold;
}

.range-input {
    width: 100%;
    height: 6px;
    background: var(--cyber-border);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.range-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--cyber-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--cyber-glow);
}

.range-input::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--cyber-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--cyber-glow);
}

.value-display {
    color: var(--cyber-primary);
    font-family: 'Share Tech Mono', monospace;
    font-weight: bold;
    text-align: center;
}

.color-input {
    width: 60px;
    height: 40px;
    border: 2px solid var(--cyber-border);
    border-radius: 4px;
    cursor: pointer;
    background-color: var(--cyber-dark);
    transition: all 0.3s ease;
}

.color-input:hover {
    border-color: var(--cyber-primary);
    box-shadow: var(--cyber-glow);
}

.color-preset {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 2px solid var(--cyber-border);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.color-preset:hover {
    border-color: var(--cyber-primary);
    transform: scale(1.1);
}

.checkbox-label {
    flex-direction: row;
    align-items: center;
    gap: 10px;
}

.checkbox-input {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--cyber-primary);
}

.select-input {
    padding: 10px;
    background-color: var(--cyber-dark);
    border: 1px solid var(--cyber-border);
    border-radius: 4px;
    color: var(--cyber-text);
    cursor: pointer;
    font-size: 0.95em;
}

.select-input:focus {
    outline: none;
    border-color: var(--cyber-primary);
    box-shadow: var(--cyber-glow);
}

.custom-size {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 10px;
}

.custom-size.hidden {
    display: none;
}

.size-input {
    width: 80px;
    padding: 8px;
    background-color: var(--cyber-dark);
    border: 1px solid var(--cyber-border);
    border-radius: 4px;
    color: var(--cyber-primary);
    font-family: 'Share Tech Mono', monospace;
    text-align: center;
}

.text-input {
    padding: 10px;
    background-color: var(--cyber-dark);
    border: 1px solid var(--cyber-border);
    border-radius: 4px;
    color: var(--cyber-text);
    font-size: 1em;
}

.text-input:focus {
    outline: none;
    border-color: var(--cyber-primary);
    box-shadow: var(--cyber-glow);
}

/* 画布区域 */
.canvas-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.canvas-wrapper {
    position: relative;
    background-color: rgba(20, 20, 20, 0.8);
    border: 2px solid var(--cyber-border);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

#signatureCanvas {
    border: 2px dashed var(--cyber-primary);
    border-radius: 4px;
    cursor: crosshair;
    box-shadow: var(--cyber-glow);
    background-color: #1a1a1a;
    touch-action: none;
}

.canvas-placeholder {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.2);
    font-size: 2em;
    pointer-events: none;
    text-align: center;
    font-family: 'Orbitron', sans-serif;
    text-shadow: 0 0 20px rgba(0, 255, 159, 0.3);
}

.canvas-placeholder.hidden {
    display: none;
}

.canvas-info {
    display: flex;
    justify-content: space-between;
    padding: 10px 15px;
    background-color: rgba(0, 184, 255, 0.1);
    border: 1px solid var(--cyber-secondary);
    border-radius: 4px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.9em;
}

#canvasInfo {
    color: var(--cyber-primary);
}

.hint {
    color: #888;
}

/* 按钮 */
.action-buttons {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    padding: 20px;
    background-color: rgba(26, 26, 26, 0.8);
    border: 1px solid var(--cyber-border);
    border-radius: 6px;
}

.btn {
    padding: 12px 24px;
    border: 1px solid;
    border-radius: 4px;
    cursor: pointer;
    background-color: transparent;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: bold;
    font-size: 0.95em;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 1.2em;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.btn:not(:disabled):hover::before {
    left: 100%;
}

.btn-primary {
    border-color: var(--cyber-primary);
    color: var(--cyber-primary);
}

.btn-primary:not(:disabled):hover {
    background-color: var(--cyber-primary);
    color: var(--cyber-dark);
    box-shadow: var(--cyber-glow);
}

.btn-secondary {
    border-color: var(--cyber-secondary);
    color: var(--cyber-secondary);
}

.btn-secondary:not(:disabled):hover {
    background-color: var(--cyber-secondary);
    color: var(--cyber-dark);
    box-shadow: var(--cyber-glow-secondary);
}

.btn-accent {
    border-color: var(--cyber-accent);
    color: var(--cyber-accent);
}

.btn-accent:not(:disabled):hover {
    background-color: var(--cyber-accent);
    color: var(--cyber-dark);
    box-shadow: var(--cyber-glow-accent);
}

.btn-warning {
    border-color: var(--cyber-warning);
    color: var(--cyber-warning);
}

.btn-warning:not(:disabled):hover {
    background-color: var(--cyber-warning);
    color: var(--cyber-dark);
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.btn-mini {
    padding: 6px 12px;
    background-color: transparent;
    border: 1px solid var(--cyber-secondary);
    color: var(--cyber-secondary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85em;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn-mini:hover {
    background-color: var(--cyber-secondary);
    color: var(--cyber-dark);
}

/* 预览区域 */
.preview-section {
    background-color: rgba(26, 26, 26, 0.8);
    border: 1px solid var(--cyber-border);
    border-radius: 6px;
    padding: 25px;
    margin-bottom: 30px;
}

.section-title {
    color: var(--cyber-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
    font-size: 1.2em;
    text-shadow: var(--cyber-glow);
    display: flex;
    align-items: center;
    gap: 10px;
}

.title-icon {
    font-size: 1.3em;
}

.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.preview-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.preview-label {
    color: var(--cyber-secondary);
    font-weight: bold;
    font-size: 0.9em;
    text-align: center;
}

.preview-box {
    height: 200px;
    border: 1px solid var(--cyber-border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.preview-box img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.white-bg {
    background-color: #ffffff;
}

.black-bg {
    background-color: #000000;
}

.transparent-bg {
    background-image: 
        linear-gradient(45deg, #808080 25%, transparent 25%),
        linear-gradient(-45deg, #808080 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #808080 75%),
        linear-gradient(-45deg, transparent 75%, #808080 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

/* 帮助区域 */
.help-section {
    background-color: rgba(26, 26, 26, 0.6);
    border: 1px solid var(--cyber-border);
    border-radius: 6px;
    padding: 25px;
}

.help-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.help-item {
    padding: 15px;
    background-color: rgba(20, 20, 20, 0.8);
    border-left: 3px solid var(--cyber-secondary);
    border-radius: 4px;
    line-height: 1.6;
    font-size: 0.95em;
}

.help-item strong {
    color: var(--cyber-primary);
    margin-right: 5px;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }

    .toolbar {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .page-title {
        font-size: 1.8em;
    }

    .header-nav {
        flex-direction: column;
        align-items: flex-start;
    }

    #signatureCanvas {
        max-width: 100%;
        height: auto;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .preview-container {
        grid-template-columns: 1fr;
    }

    .toolbar {
        grid-template-columns: 1fr;
    }
}